Hi All, I seem to have an very intermittent issue where sometimes as I'm driving along, the MS2 just seems to reboot/lose sync, it happens so fast it's very hard to see what's happening other than I think I can tell it's restarted as ASE kicks in again like I've just started the car. When this happens the car just stumbles for a second and then goes rich while ASE is active, after that it's back to normal.

It doesn't happen very often but I'd just like to know if there's any common causes for this and what I should be looking for? Doesn't seem a massive issue but obviously don't want it to happen when I'm at WOT at high rpm!

Unfortunately I don't have a log, it's that intermittent that it never seems to happen when I am logging! Just my luck! Doh!

Thanks for the reply, ok, do you think it could be interference on the wires from the MS to the stock loom that I wired in? Or is it more likely a damaged wire or a faulty CAS? If it could be interference, is there any recommendation for wire thickness or insulated wire for the CAS sensor? I've used 16/0.2 wire for everthing on the MS loom which I believe it equivalent to 20g US wire.

Hopefully it's not the CAS itself and I imagine I'd be getting other issues or it would be losing sync more often if the CAS itself was faulty?

Thanks again. Apologies if the above are stupid questions, I'm still very new to all this and learning as I go!

gslender wrote:You will need to figure out how to make it reliably reoccur. Until then it is close to impossible to diagnose.

Didn't you use the stock connector? Is it wired into the harness or via a plug?

G

Ok, that's fair enough but thanks for the reply. I've connected the MS to the stock loom via a short loom and 64 pin plug, so yeah it plugs straight into the stock loom. The only sensors outside the stock loom is the IAT sensor and TPS sensor. So I was wondering if my wiring from the MS to the stock loom could be the issue maybe if I hadn't used the correct grade wire or something silly I'd done!

Peter Florance wrote:Be sure you can pass this test:if you unplug MS box and measure resistance from any sensor's (MAT, CLT, TPS) ground to car/engine ground , you should not have continuity.

Matt Cramer wrote:I noticed there's substantial noise on the battery voltage trace. This may be causing noise elsewhere. Where is the MS getting power and ground?

Just a question on this, how I can check for noise on the battery voltage? Is it just a case of checking my logs or could I look for voltage fluctuation at the battery with the car running and at different loads?